package org.example;

class Money {
    public double money;
}

class Student implements Cloneable{
    public int age;

    public Money m = new Money();

    public Student(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "age=" + age +
                '}';
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}

public class Test2 {
    public static void main(String[] args) throws CloneNotSupportedException {
        Student student1 = new Student(10);
        student1.m.money = 19.9;
        Student student2 = (Student) student1.clone(); // 编译报错
        System.out.println(student1.m.money);
        System.out.println(student2.m.money);

        System.out.println("==============");
        student1.m.money = 29.9;
        System.out.println(student1.m.money);
        System.out.println(student2.m.money);
    }
}
